<template>
	<view>
		<!--使用自定义的搜索组件-->
		<!--<my-search :bgcolor="'#000000'" :radius="3"></my-search> //通过props自定义组件-->
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!--左侧滑动区-->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh+'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i===active?'active':'']" 
					@click="activeChanged(i)">{{item.cat_name}}</view><!--页面中先执行函数再渲染页面-->
				</block>
				
			</scroll-view>
			<!--右侧滑动区-->
			<scroll-view scroll-y="true" :style="{height: wh+'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!--二级分类的标题-->
				<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
				<!--当前二级分类下的三级分类列表-->
				<view class="cate-lv3-list">
				<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList">
					<!--三级分类的图片-->
					<image :src="item3.cat_icon" mode=""></image>
					<!--三级分类的文本-->
					<text>{{item3.cat_name}}</text>
				</view>
				</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins:[badgeMix],
		data() {
			return {
				//当前设备的可用高度
				wh:0,
				cateList:[],
				active:0,
				//二级分类列表
				cateLevel2:[],
				scrollTop:0
			};
		},
		onLoad(){
			const sysInfo=uni.getSystemInfoSync()
			this.wh=sysInfo.windowHeight-50
			this.getCateList()
		},
		methods:{
			//获取分类列表
			async getCateList(){
				const {data:res}=await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status!==200) return uni.$showMsg()
				this.cateList=res.message
				
				//为二级分类赋值
				this.cateLevel2=res.message[0].children
			},
			activeChanged(i){
				this.active=i;
				
				//重新为二级分类赋值
				this.cateLevel2=this.cateList[i].children
				this.scrollTop= this.scrollTop === 0 ? 0.01 : 0
			},
			//跳转到商品列表
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
}
.left-scroll-view{
	width: 120px;
}
.left-scroll-view-item{
	background-color: #F7F7F7;
	line-height: 60px;
	text-align: center;
	font-size: 12px;
	
	&.active{
		background-color: #FFFFFF;
		position: relative;
		
		&::before{
			content: ' ';
			display: block;
			width: 3px;
			height: 30px;
			background-color: #C00000;
			position: absolute;
			top: 50%;
			left: 0;
			transform: translateY(-50%);
		}
	}
}
.cate-lv2-title{
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	.cate-lv3-list{
		display: flex;
		flex-wrap: wrap;
		.cate-lv3-item{
			width: 33.3%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;
			image{
				width: 60px;
				height: 60px;
			}
			
			text{
				font-size: 12px;
			}
		}
	}
</style>
